COMPARATIVE ANALYSIS OF PLATE GIRDER DESIGNS ON NON- COMPOSITE BRIDGES BETWEEN AASHTO LRFD BRIDGE DESIGN SPECIFICATIONS 2017 CODE WITH SNI 1729:2015 CODE

This study aims to the structural design of non-composite plate girders using AASHTO LRFD Bridge Design Specifications 2017 code compared to SNI 1729:2015 code. The span of the bridge used as the object of study is 40 meters with a width of 10 meters. In this study, plate girders are designed based on AASHTO code and SNI code, then also given the loading according to SNI 1725:2016 code, and in the analysis of the structure using CSi Bridge software to get the value of internal forces i.e. Moment Force (Mu) of 3595.38 kNm and Shear Force (Vu) of 449.9968 kNm. The results obtained from this study are the non-composite bridge plate girder designed with AASHTO LRFD Bridge Design Specifications 2017 and SNI 1729:2015 obtained the stability requirements of strong boundary conditions flexure design. Then obtained Nominal Moment value (ØMn) of 8016.843 kNm for AASHTO LRFD Bridge Design Specifications 2017 and Nominal Moment value (ØMn) of 6081.97 kNm for SNI 1729:2015. From the values obtained it can be concluded that the two regulations produce a safe and strong plan as per the applicable provisions namely Moment (Mu <ØMn).


INTRODUCTION
Indonesia is an archipelago with an area of water that reaches 64.97% of the total area (Bakosurtanal, 2014) (1). But that is not an obstacle for the central government to carry out the mandate of the nation listed in the Pancasila precisely in the 5th precept that reads "Social Justice for All Indonesian People".
Engineers in the construction world are expected to be able to actively participate in this national development effort. One type of construction that will be used in these efforts is a bridge. The bridge consists of many models and of course related to their respective functions. From a small bridge that serves to cross people located on the highway to a large bridge connecting inter-island that can be passed by motorized vehicles, such as motorcycles, cars, trucks, buses and so forth. In its planning, the bridge itself is divided into several construction components such as: a) Abutment b) Bearings c) Pier d) Pile cap e) Bored Pile f) Girder (Composite / Non-Composite) g) Deck h) Highway i) Sidewalks j) Tension Of all the construction components, of course there are planning rules that are binding, standard and systematic. One of them is the component construction of the plate girders. Fig. 1 Application Of Using Plate Girder Bridges On Japek II Elevated Toll Road Source: Data in research, 2019 Plate girder is a large beam that is made from the arrangement of plate elements that are joined with a connecting tool to get a more efficient arrangement of material than that obtained with a wrought beam (rolled beam). Steel material has mechanical properties that are strong against compressive / tensile forces, but it should be noted that the stability of bending. Basically, construction of large bridges will require relatively long stretches and it is also likely to be without a column / pier in the middle, therefore this plate girder selection is one of the solutions in implementing bridge construction work. In the design of this steel frame bridge, it will use two bridge structure design regulations, namely using the AASHTO LRFD Bridge Design Specifications (American) and SNI (Indonesia), which in the end can be seen differences and similarities in the results of the design. The two construction regulations together show how to calculate and analyze plate girders. The differences and design similarities of the two reference rules will be discussed in my study this time.
The bridge is a part of the road that functions to connect between two separate roads due to obstacles such as rivers, valleys, seas, highways, and railroad tracks. The bridge is very vital function of human life, and has an important meaning for everyone. However, the level of importance is not the same for everyone, so it will be an interesting study material (Bambang Supriyadi, 2007) (2).

RESEARCH METHODOLOGY
The method that the author uses in this research is carried out by the method of literature study. Literature study is a description of the theoretical foundations relating to non-composite bridge planning. Literature studies are sourced from books, regulatory standards, and journals related to structural planning for non-composite bridges.  The truck load 'T' used is in accordance with SNI 1725: 2016 [8] as shown Lane density factors must be calculated according to Table 3.1  Table 3

Load Combination
The combination of loading for Strong Boundary Conditions must comply with SNI 1725: 2016 as given in Table 3.2 as follows:  Figure 10 shows the 3D appearance of the non-composite bridge model. The value of the shear force on the interior of the slab 2 V2 = -7.5063 From the above data, the largest Shear Force (Vu) value is taken, which is found in the interior of girder 1, which is: -449.9968 kNm

Calculation of Inertia and Center of Cross Section
In the calculation of inertia and cross-section emphasis is done using Microsoft Excel and obtained the following data:     Table   CLOSING In this chapter, the authors provide conclusions and suggestions relating to the results that the authors examined. The conclusion was obtained from the results of the analysis and interpretation of existing data. Meanwhile, suggestions are given as reference material in subsequent studies.

CONCLUSIONS
From the comparative studies that have been made, some conclusions can be drawn, as follows: 1. In planning the plate girder bending using AASHTO LRFD Bridge Design Specifications 2017 gives a greater ØMn value so that a smaller profile dimension can be used than the results of planning using SNI 1729: 2015.

Suggestions
From the comparative studies that have been carried out, several things that can be developed in further research are as follows: 1. It is necessary to compare non-composite bridge planning based on AASHTO LRFD Bridge Design Specifications 2017 and SNI 1729: 2015 for Constructability, Serviceability, Fatigue and Fracture.