Moving Load

Truck, lane and combined moving-load analysis for a single bridge girder.

Overview

Moving Load is the Beam application in the JSCAD workspace. It evaluates a single-girder model in the XZ plane under truck, lane and concurrent truck/lane cases, then presents influence lines, physical loading positions and internal-force envelopes. It is being developed for the company's bridge-design automation workflow; the product is not publicly released, and the linked application is a demo.

Technical capabilities

Moving vehicles and lane loading create different governing positions along a bridge girder, so response envelopes need to retain the loading arrangement behind each result.

Technical scope

Define truck-only, lane-only and concurrent truck/lane moving-load cases on a single-girder model.
Run linear frame analysis with the browser solver or an optional OpenSees backend.
Inspect influence lines, vehicle and lane placement, and maximum or minimum force envelopes.
Review static load cases and moving results in the shared load-case and combination workflow; member design checks are outside the Beam product scope.

Images

Girder influence line with a vehicle and distributed lane load placement — Lane loading on the influence line

Beam analysis view showing concurrent vehicle and lane loading over a multi-span girder — Combined truck and lane loading

Maximum and minimum bending-moment envelope plotted along a continuous girder — Moving-load bending-moment envelope

Contribution

Connect girder modelling and moving-load definitions to one analysis workflow.
Show physical truck/lane loading positions beside influence and envelope results.
Keep static, moving and combination results distinguishable for review.